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But their presence or absence is never an assurance that there is not something within the wall cavity. 5 System 10 InWall Speakers There must be a minimum depth behind the wall face of 3 5/8 (92 mm). Be sure to keep the edges of the cutout at least 1 inch (25 mm) away from any stud or obstruction. The speaker assembly itself (the part with the drivers mounted in it, the trimming bezel, etc.) is designed to mount to the Installation Bracket after it has been installed within the wall.